code: def __len__(self):
      return self.num_samples
  
file_path: pytorch-meta/torchmeta/toy/sinusoid_line.py
imports: import numpy
  from torchmeta.utils.data import Task, MetaDataset
  from torchmeta.toy.sinusoid import SinusoidTask
label_desc: Use image node_id 2 for calling the LinearTask obj's underlying member method code with example usage: obj.__len__() and returns: self